The Quality Protein Maize ‘Quanyu No.9’: QTL Mapping of Main Nutritional Quality Traits

doi:10.11924/j.issn.1000-6850.casb2023-0889

Abstract

Abstract:

Oil, protein and starch are the main nutritional components of maize kernels, and they are also important quality traits of maize. In order to explore more QTLs related to maize quality, the F_2:3 population constructed by quality protein maize 'Quanyu No.9' was used as the material to measure the quality traits in Xindu and Jianyang. QTL analysis was performed using ICIM mapping4.1 software. In this study, a total of 24 QTLs for quality traits were detected in the two locations, of which 9, 9 and 2 QTLs were only associated with oil content, protein content and starch content, respectively, and 4 QTLs were associated with multiple quality traits. These QTLs were distributed on 10 chromosomes, and the phenotypic contribution rate explained by a single QTL was 1.92%-34.43%. The QTL located in Bin7.01 (6399330-8305989) on the chromosome was detectable in both environments, explaining 12.68%-18.13% of phenotypic variation with additive effects. It is the major QTL controlling oil content in corn. This study provides basic data for molecular assisted breeding of maize quality improvement and provides strong support for subsequent breeding practice.

Key words: corn, grain quality, quality traits, oil, oil content, protein, protein content, starch, starch content, QTL mapping, genetic analysis, major QTL

LI Yan, LIANG Zenghao, YANG Rongzhi, LIU Zhitao, TAN Jun, DENG Luchang, CHEN Jie, YANG Lin, HE Wenzhu, ZHU Yonghui, TANG Haitao. The Quality Protein Maize ‘Quanyu No.9’: QTL Mapping of Main Nutritional Quality Traits[J]. Chinese Agricultural Science Bulletin, 2024, 40(23): 16-21.

Figures/Tables 4

References 26

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性状	地点	变异范围	变异系数	峰度	偏度
油分	新都	2.55~5.20	0.49	0.46	0.46
油分	简阳	2.90~6.00	0.53	0.54	0.68
蛋白质	新都	9.05~15.60	1.11	0.64	-0.57
蛋白质	简阳	7.95~13.15	0.99	-0.35	-0.35
淀粉	新都	68.45~72.10	0.64	0.11	-0.09
淀粉	简阳	69.05~73.15	0.71	0.07	-0.25

性状	地点	变异范围	变异系数	峰度	偏度
油分	新都	2.55~5.20	0.49	0.46	0.46
油分	简阳	2.90~6.00	0.53	0.54	0.68
蛋白质	新都	9.05~15.60	1.11	0.64	-0.57
蛋白质	简阳	7.95~13.15	0.99	-0.35	-0.35
淀粉	新都	68.45~72.10	0.64	0.11	-0.09
淀粉	简阳	69.05~73.15	0.71	0.07	-0.25

性状	地点	基因型	地点×基因型
油分	237.38^**	7.58^**	1.05
蛋白质	1771.28^**	7.48^**	1.37^**
淀粉	245.28^**	3.16^**	1.18

性状	地点	基因型	地点×基因型
油分	237.38^**	7.58^**	1.05
蛋白质	1771.28^**	7.48^**	1.37^**
淀粉	245.28^**	3.16^**	1.18

性状	油分	蛋白质	淀粉
油分	1.00	-.213^**	-0.05
蛋白质	-0.221^**	1.00	0.04
淀粉	-0.149^*	0.159^**	1.00